Apparatus for expanding couplings.



h n. M. M0 WAT.- APPARATUS FOR EXPANDINGl GOUBLINGS.'

1,105,094. '.PanteaJu1-y2's,1914;

.APPLIOATION FILED MAS.. 31, `1910.l

UNITED STATES .PATENT OFFICE.

OLIVEE M. MOWAT, or MOKEESPOET, PENNSYLVANIA, AssIGNoE To THE NATIONALTUBE COMPANY, OE PITTSBURGH, PENNSYLVANIA, A CORPORATION OF NEW JERSEY.

APPARATUS FO-R EXPANDING COUPLINGS.

To all whom 'it may concern:

Be it known that I, OLIVER M. MOWAT, of McKeesport, Allegheny county,Pennsylvania, have invented a new and useful Apparatus for ExpandingCouplings, of which the following is a full, clear, and exactdescr1ption. i

My invention relates to the manufacture of pipe couplings and similarannular bodies, and the object of the invention is to provide improvedmeans for expanding the couplings, and more particularlyfor expandingthe couplings after they have been tapped or internally threaded.Heretofore it has been proposed to expand such couplings by means ofexpandin dies which were forced outwardly by driving a plug into anopening in the expanding tool, and in this way taper the coupling fromeach end inwardly toward the center of its length, this operation beingperformed after thev threading operation.

The object of my invention is to provide improved apparatus forexpanding such couplings having novel means for tapering the innersurface of the couplings from the ends toward the center of the lengthof the couplings.

A further object of the invention is to provide apparatus havingimproved means for expanding the couplings with which couplings ofvarious sizes are tapered, and apparatus having means for centering thecouplings in place on the expanding dies forming part of the apparatus.

Referring to the drawings forming partl -of this specication, Figurelv'is a plan` showin coupling expanding apparatus constructe andarranged in accordance with my invention. Fig. 2 is a longitudinalsectional elevation of the same. Fig. 3 is an end elevationlooking fromthe front end of the machine toward the driving motor by which theapparatus is operated. Fig. 4 is '-a detail section on a larger scale,showing the expanding dies and the means by which dies are caused toexpand, and to collapse, in the operations of tapering and expanding thecouplings. Fig. 5 is a sectional detail showing the clutch'j'aws held indisengaged -or inoperative position.

In the drawings, 2 designates acoupling in position on the expandingdies and 3-3 are collapsing dies which are-removably secured to theradially'movable `die heads 4.

Specification of Letters Patent.

Application led March 31, 1919. Serial No. 552,588.

atented July 28, 191.4.

The heads 4 are movably secured on the diehead frame 5 forming part ofthe base Giof the apparatus, suitable slides being provided in which theheads 4 are reciprocated. heads 4- are moved inwardly and are yieldinglyheld in their collapsed position on the die-head by means ofthe bolts 7and heli-` cal springs 8, the tension on the springs be-A bysubstituting larger or smaller taperedv expanding portions 10 on thestraight section 11 to suit the different sizes of couplings, theexpanding dies 3 also being changed to larger or small sizes.

The threaded portion 12 of the expanding mandrel is screwed into asleeve 13, and the sleeve 13 is screwed in place on the cross head 14and locked by means of the locking b olt 15. The cross 'head la isslidingly mounted in the ways 16 forming part ofthe base 6 and isconnected by n wrist pin 17 andy pitman '18 witlrthe crank shaft 19. Thecrank shaft 19 is mounted in bearings 20 forming part of the base 6 andon its outer end is an outnf'ardly movable clutch member 21 having aflange 21EL provided with anangular face portion 2lb, the clutch member21 being splined or otherwise slidingly mounted on the crank shaft. Alsomounted Thev on the crank shaft 1S) so as to rotate freely thereon is aspur gear 22 having an integral clutch jaw member 23 which is arrangedto engage with the axially. movable jaw melmber 21 of the clutch. Thespurgear 22 meshes with a spur pinion 24 on the shaft 25, this shaftbeing connected by the lslowdown gears 27 and- 27 with the armatureshaft 28 of the driving motor 29. The shaft 25 is provided with a. flywheel 26 on one of its ends, 'and is mounted in bearings 30 on the base6 of the apparatus.

A treadle 31 is connected shaft'?, lever 38, link or rod 39 and'bell bythe rocking i crank 40 to a stop .32 lrlidably mounted 'in 110 the stopguide 32a. The stop 32 is arranged to engage with the angular face 21bon the fiange 2la and move the clutch member 2l on the shaft 19 so as tobe disengaged from the clutch'member 23. lVhen the lclutch member .21bis'so moved the stop 32 is projected forwardly in its guide 32a throughthe medium of the spring 32b in 'the guide 32a, so as to engage with theside surface of the vflange 2l (as shown in Fig. 5) and hold the movableclutch 'member in its disengaged position.' Movable member 21 of the jawclutch is held in its disengaged position until released by the operatorthrough the treadle 3l and a helical spring 33 which is providedon theen'd of the shaft 19 is arranged to move the jaw member 21 into itsclutching position when released by the stop 32. V

Secured on the movable heads 4 by bolts 34 is a yielding stop 35 bymeans of which the longitudinal position of the coupling 2 relativeto`the expanding dies is regulated.

Springs 36 are provided on the bolts 34 to cushion the coupling when putinto place i" 'by the operator.

In the operation of my improved apparatiis the motor 29 is caused toconstantly rotate and through the connecting slow `down gearing torotate the spur gear 22 h'aving the clutch member 23 secured thereto.The expanding mandrel 10 having been adjusted longitudinally on thecross head 14 to suit the particular set of dies being used and the sizeof couplings being ex panded, the couplings are placed in position onthe expanding dies 3 and the operator by manipulating the treadle 31retracts the stop 32 and releases the clutch jaw 2l which permits thespring 33 to move this jaw member into clutching engagement with theclutch jaw 23. Thecrank shaft 19 is in this way caused to rotate and,through the connecting mechanism, to reciprocate the tapered mandrel 10in the expanding dies 3. When one revolution of the shaft 19 is made,the angular face V21h by engagement with the end of the stop 32 causesthe clutch member 2l to slide on the shaft 19 and the clutch jaw 21 isautomatically drawn into and held in its disengaged position until againreleased by the operator. WVhen the mandrel 10 is reciprocated the dies3 are forced radially outwardl and thel tapering peripheral faces of thedies expand the inner surface of the coupling to the same taper as thefaces of the dies. Then the dieshave been expanded, the joints betweenthe radially movable segments are opened and this operation does notexpand the coupling on lines opposite the joints. For this reason, whenthe mandrel l0 hasbecn drawn inwardly and again moved outwardly intoposition to permit collapsing of the dies, the operator turns thecoupling on the dies through a part of a revolution so as to bringposition the couplings on the die,

the parts located opposite the joints in the dies during the firstexpanding operation into position opposite anothjaoint on the dies whichis located between the joints, The mandrel 10 is then again reciprocatedinwardly and outwardly andl the dies forced outwardly a second time,this operation expanding the unexpanded portions of the coupling whichwere opposite the joints in the dies in the first expanding operation.

As the couplings are preferably tapered or threaded with a straightthread before the expanding operatin, it is necessary that the points ofthe threads on the coupling be substantially opposite the root of thethreads on the dies and for this reason the stop 34 is adjustablysecured on thehead 4, in this' way insuring that the coupling will beplaced lengthwise in proper position relative to the dies.

The above described operations are re-4 peated with the successivecouplings and the threaded couplings are quickly and accurately taperedfrom their ends inwardly, the double taper of these couplings beingaccomplished with the one operation.

The-advantages otmy invention will be apparent to those skilled in'theart. The distance the coupling is expanded may be varied and the poweremployed may be regulated by adjusting the mandrel axiallyin the crossheadf` 1 Modifications in the construction and arrangement of the partsmay be made Without departing from my invention.

I claim 1. Apparatus for expanding pipe couplings and the likecomprising in combination. a segment-al expanding die havingradiallymovable sections, a stop Vto position the couplings on the die, a taperpin lengthwise movable within the die for expanding the die sections,means for adjusting the pin leiigthwise within the die, and power meansconnected to Asaid taper pin for reciprocating the pin within the die inthe coupling expanding operations.

2. Apparatus for expanding pipe couplings and the like comprising incombina-4 tion a segmental expanding die having radiallyniovalile'scctions, a yielding stop to lengthwise movable within the diefor expanding the die sections, means 'For contracting the die sections,a reciprocating cross head adjustably connected to the taper pin, andpower means -for actuating thc cross head to reciprocate the taper pinand expand. the die sections in the coupling expanding operations.

3. Apparatus for expanding pipe couplings and the like comprising anexpanding .die, a taper pin lengthwise movable within said'die forexpanding the die sections, means for adjusting the pm. lengthwise ataper pin I Within the die,and power means connected ments, meansengaging with and expanding the die within couplings placed thereon, anda horizontally reciprocating cross head connected to the die expandingmeans, of a r0- tary motor Jfor actuating the cross head and dieexpanding means7 and mechanism detach-ably connecting the motor withsaid cross head.

In testimony whereof, I have hereunto set my hand.

OLIVER M. MO'WAT.

Yitnesses Tiros. lV. BELL, Jos. IV. BLACKBURN.

